Why was 0.5g of substrate added to all of the tubes instead of varying amounts of substrate

Use this new information to determine the parents’ genotypes (indicated by red arrows). then calculate the probabilities that the second male offspring will have each condition. drag one pink label to each pink target and one blue label to each blue target. then use the white labels to answer questions 1 and 2. labels can be used once, more than once, or not at all.

Are the earth's ocean floor and continents the same age geologically? why or why not?

What pattern of migration do whales follow?